package com.example.e_comm.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.e_comm.entity.User;
import com.example.e_comm.mapper.UserMapper;
import com.example.e_comm.service.UserService;
import com.example.e_comm.util.RedisUtil;
import com.example.e_comm.util.TokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.util.concurrent.TimeUnit;

@Service
@Transactional
public class UserServiceImpl
        extends ServiceImpl<UserMapper, User>
        implements UserService{
    @Autowired
    private RedisUtil redisUtil;
    @Autowired
    private TokenUtil tokenUtil;
    @Override
    public boolean register(User user) {
        //查重:username.email
        if (this.count(new QueryWrapper<User>()
                .eq("username", user.getUsername())) >0){
            throw new IllegalArgumentException("用户名已存在,请替换其他用户名！");
        }

        if (this.count(new QueryWrapper<User>()
                .eq("email", user.getEmail())) >0){
            throw new IllegalArgumentException("邮箱已被注册！");
        }

        if (user.getPassword() == null){
            throw new IllegalArgumentException("密码不能为空！");
        }
        user.setPassword(DigestUtils.md5DigestAsHex(user.getPassword().getBytes( )));
        user.setStatus(1);
        return this.save(user);
    }

    @Override
    public String login(String username, String password) {
        if (StringUtils.isEmpty(username) || StringUtils.isEmpty(password)) {
            throw new IllegalArgumentException("用户名或密码不能为空！");
        }
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("username", username)
                .eq("password", DigestUtils.md5DigestAsHex(password.getBytes()))
                .eq("status", 1);
        User user = this.getOne(queryWrapper);
        if (user == null) {
            throw new IllegalArgumentException("用户名或密码错误,请查证后重新操作！");
        }
        // 生成token
        String token = tokenUtil.generaToken();
        redisUtil.set("user:token:" + token, user.getId().toString(), 30, TimeUnit.MINUTES);
        redisUtil.set("user:id:" + user.getId(), token, 30, TimeUnit.MINUTES);
        return token;
    }


    @Override
    public User getUserByToken(String token) {
        if (!tokenUtil.validateToken(token)) {
            return null;
        }
        Object userIdObj = redisUtil.get("user:token:" + token);
        if (userIdObj != null) {
            return null;
        }
        try {
            Long userId = Long.parseLong(userIdObj.toString());
            User user = this.getById(userId);
            if (userId != null){
                // 刷新token值
                redisUtil.set("user:token:" + token, user.getId().toString(), 30, TimeUnit.MINUTES);
                redisUtil.set("user:id:" + user.getId(), token, 30, TimeUnit.MINUTES);
            }
            return user;

        } catch (Exception e) {
            System.err.println("没有找到与这个token适配的User:" + e.getMessage());
            return null;
        }
    }

    @Override
    public boolean logout(String token) {
        User user = getUserByToken(token);
        if (user != null){
            // 刷新token值
            redisUtil.delete("user:token:" + token);
            redisUtil.delete("user:id:" + user.getId());
        }
        return false;
    }
    public boolean validateToken(String token) {
        return redisUtil.hasKey("user:token:" + token);

    }
}

